Use meaningful variable names, rather than i, j, k and cl.
Correctly calculate the key block length when used with export ciphers.
While here, use meaningful variable names and simplify the calculation.
Overhaul the keyblock handling in ssl3_change_cipher_state(). Use
meaningful variable names with use with pointer arithmitic rather than
complex array indexing.
Correctly calculate the key block length when using export ciphers.